C# 取几个不重复的随机的值(几种方案)_c#随机抽取数组里的数不重复-优快云博客

本文介绍四种不同的方法来从一个整数列表中随机选择四个不重复的元素，并展示如何将这些选中的元素转换为字符串形式进行展示。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

       public static void DisplayMsg(string sCaption, string sMsg)
       {
           sMsg = sMsg.TrimEnd('!').TrimEnd('！') + " !";
           MessageBox.Show(sMsg, sCaption);
       }

            List<int> arr = Enumerable.Range(0, 11).ToList<int>();
            List<int> result = new List<int>();
            Random ran = new Random();
            for (int i = 0; i < 4; i++)
            {
                int temp = ran.Next(arr.Count);
                result.Add(arr[temp]);
                arr.RemoveAt(temp);
            }
            string sResult = string.Empty;
            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

sResult = sResult.TrimEnd(',');
Common.DisplayMsg(this.Text, sResult);

            string sResult = string.Empty;
            var num = Enumerable.Range(0, 11)
    .Select(x => new { v = x, k = Guid.NewGuid().ToString() }).ToList()
    .OrderBy(x => x.k)
    .Select(x => x.v)
    .Take(4).ToList();
            foreach (var i in num)
            {
                sResult += i + ",";
            }

sResult = sResult.TrimEnd(',');
Common.DisplayMsg(this.Text, sResult);

            string sResult = string.Empty;
            List<int> result = new List<int>();
            while (true)
            {
                Random rd = new Random();
                int a = rd.Next(11);
                if (result.Contains(a))
                    continue;

                result.Add(a);
                if (result.Count == 4)
                    break;
            }

            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

sResult = sResult.TrimEnd(',');
Common.DisplayMsg(this.Text, sResult);

            string sResult = string.Empty;
            List<int> list = new List<int>();
            List<int> result = new List<int>();
            Random rd = new Random();
            for (int i = 0; i <= 10; i++)
            {
                list.Add(i);
            }

            while (result.Count<4)
            {
                int index = rd.Next(0, list.Count);
                if (result.Contains(list[index]))
                    continue;
                result.Add(list[index]);
                list.Remove(index);
            }

            for (int i = 0; i < result.Count; i++)
            {
                sResult += result[i] + ",";
            }

sResult = sResult.TrimEnd(',');
Common.DisplayMsg(this.Text, sResult);